Duct sealing compound is a popular material used in construction, particularly in the electricity sector. It is employed to seal electrical boxes, gaskets, service mast entrances, and more. This compound can be molded into any shape and reused if necessary. However, it is not weather-resistant to the sun or rain, so it may not be suitable for outdoor use. Henry Wet Patch putty is an alternative option for repairing ducts.
This putty is designed for outdoor use and is water-based. It appears that all possible escape points were patched with duct seal, but it does not seem to be working. To seal the outside of the duct, you can use expandable closed-cell foam or silicone putty. The usage temperature range of the duct seal is 25 to 120 degrees Fahrenheit and has a tolerance range of -30 to 175 degrees Fahrenheit.
This means that the duct seal must be applied between 25 and 120 degrees Fahrenheit. Duct seal is primarily used and designed for covering holes around ducts inside buildings. However, it can also be used outside at service entrances. When exposed to the elements, it tends to dry out on the surface. Despite this, some materials can still maintain their seal after 20 years. When using putty to seal ducts, it may not form a good block of water vapor over time, especially with cables running through it.
A multi-purpose duct sealer can be used on all types of metal ducts, fiberglass duct plates, duct fabrics, and flexible ducts.